Twilight Arbor Collector bug
Have similar problem with Molten Axe from CoF got it unlocked in Account Wardrobe but not in collection even when I bought another axe of this kind didnt help it says that skin is already unlocked on my account but I dont have unlocked it in collection still
Same with SE Dark Asuran Rifle for me. Submitted a bug report too.
I have the same problem with the TA collector but for me its the Nightmare Harpoon(Spear)
Same problem but mine is Kodan Greatsword.
Same here with Arah Axe. Posted a thread here two months ago now. No official reply.